NEED ADVISE.

Hi mommies. Any idea on how to stop baby from sucking his fist and fingers? Mag 3 months na baby ko and recently, lakas niya mag suck sa kamay nya. Should I let my baby continue doing it or dapat e.stop? Tinatanggal ko talaga hands nya if sinusubo na sa mouth but may times na talagang gusto nya mag suck. Please advise po. Tnx..